Error: Query: SELECT [key],[value] FROM [mediawiki].[bs_settings] Function: DatabaseMssql::select Error: 208 [SQLSTATE 42S02][Error Code 208][Microsoft][ODBC Driver 11 for SQL Server][SQL Server]Invalid object name 'mediawiki.bs_settings'. [SQLSTATE 42000][Error Code 8180][Microsoft][ODBC Driver 11 for SQL Server][SQL Server]Statement(s) could not be prepared.
Solution: Unfortunately MS SQL database backend is not supported by BlueSpice. I recommend using MariaDB or MySQL. Also MediaWiki version 1.26 is not fully supported yet. You should use MediaWiki 1.23 wich is the current LTS (Long Term Support) release.